Yamaha outboards impeller change manual

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Impeller is a crutial part in marine engines. It is the main part of the water pump and is used to pump fresh and cold water to the engine cooling system. That is why it is so important to check its state very often. If your impeller is broken you may damage your engine becouse of overheating. There is an unwritten rule that says that you should replace your impeller on your Yamaha outboards every two years even if it’s in good condition.

Replacing your Yamaha outboard impeller

First we unscrew the four screws that are visible on the side of the yamaha outboard heel.

Next we have to remove the rubber plugin on the narrow end of the outboard motor and we unscrew the zinc protector that is located above the proppeler

We remove the zinc protector and we unscrew the number 12 bolt from the bottom side

Next we have to remove yamaha outboards heel and remove it from the outboard motor

We have to buy original Yamaha outboard impeller

Next we remove the four bolts from the water pump housing

We use a hammer to gently tap on the water pump housing to remove it (Warning: Handle with care!!)

What we see in front of us is a Yamaha outboard motor shaft with a small rubber proppeler attatched to it => that is impeller

We take the impeller of the shaft (if it won’t go of we use a knife on it)

We put our newly bought original Yamaha outboard impeller on the shaft and put a small metal plugin inside a little hole in the shaft to hold the impeller in place

We put the water pump housing back in place and we have to wrap the impeller blades to fit inside the pump housing

The blades must be slightly bent inside the water pump housing

We than screw everything back in its place, and before you put your screws in you might consider lubricating them with a water resistant lubricant (YamaLube)

You should also lubricate all the movable parts of your Yamaha outboard

Summary

Usual service cost: 150 EUR

Impeller cost: 35 EUR
Time used: 30 minutes

Money saved: 115 EUR

As you can see I managed to saved quite a large amount of money when I decided to service my own Yamaha outboard. I think that every boat owner shuld know how to do some basic motor servicing, as you never know what can happen while you are at sea.